Adding regression test

tests/cases/compiler/destructureOptionalParameter.ts

@@ -0,0 +1,25 @@
+// @strictNullChecks: true
+// @declaration: true
+
+declare function f1({ a, b }?: { a: number, b: string }): void;
+
+function f2({ a, b }: { a: number, b: number } = { a: 0, b: 0 }) {
+    a;
+    b;
+}
+
+// Repro from #8681
+
+interface Type { t: void }
+interface QueryMetadata { q: void }
+
+interface QueryMetadataFactory {
+    (selector: Type | string, {descendants, read}?: {
+        descendants?: boolean;
+        read?: any;
+    }): ParameterDecorator;
+    new (selector: Type | string, {descendants, read}?: {
+        descendants?: boolean;
+        read?: any;
+    }): QueryMetadata;
+}